Prepare 0.2

[bmu]

updated version and prepared whatsnew.

We should add a whatsnew now, to document all changes in 0.2.
Should be independent of the outcome of the development workflow discussion in #53

[wholmgren]

Oh good, I forgot about needing to change this.

I noticed that the new what's new file lists all contributors up to present instead of just the 0.2 contributors. I have a slight preference for the shorter list in the what's new file, and perhaps a longer "all contributors" list as a separate part of the documentation.

While you're working on the what's new files can you fix the release date for 0.1 (and make a note of the change in the 0.2 what's new file)?

[bmu]

done. not sure if Contributorsshould be something like Contributors for this release (or "to this"?). Than a link to the full list of contributors could be given.
But we can add this later, not necessarily within this pull request.